Because it's taxpayer money.

$4,000 for some engineers to fuck around at work might not sound much but that $4,000 came from taxing people. Believe it or not but to a lot of people $4,000 is a lot of money. That $4,000 could go to school supplies, education, WIC, Medicare, etc.

It also illustrates tax payer subsidized income inequality while a lot of people are struggling. Again some highly paid engineer making more money fucking around at work than some other taxpayer delivering real value but at lower wage.